EP2411264B1 - Chenille avec douilles rotatives pour véhicules de type à chenilles - Google Patents

Chenille avec douilles rotatives pour véhicules de type à chenilles Download PDF

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Publication number
EP2411264B1
EP2411264B1 EP10716865.0A EP10716865A EP2411264B1 EP 2411264 B1 EP2411264 B1 EP 2411264B1 EP 10716865 A EP10716865 A EP 10716865A EP 2411264 B1 EP2411264 B1 EP 2411264B1
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EP
European Patent Office
Prior art keywords
track
end flange
link
hole
pin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP10716865.0A
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German (de)
English (en)
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EP2411264A1 (fr
Inventor
Francesco Grenzi
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Berco SpA
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Berco SpA
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Publication of EP2411264A1 publication Critical patent/EP2411264A1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks
    • B62D55/20—Tracks of articulated type, e.g. chains
    • B62D55/205—Connections between track links
    • B62D55/21—Links connected by transverse pivot pins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62D—MOTOR VEHICLES; TRAILERS
    • B62D55/00—Endless track vehicles
    • B62D55/08—Endless track units; Parts thereof
    • B62D55/18—Tracks

Definitions

  • the present invention refers to a track with rotating bushings for track-type vehicles, in particular but not exclusively a track with rotating bushings for track-type vehicles intended for ground movement.
  • the tracks of a track-type work vehicle generally comprise a pair of parallel tracks, each obtained through a continuous sequence of hinge type articulated joints, connected to each other and maintained at a constant distance through suitable rigid connecting members, called "links" of the track.
  • the tracks also comprise a plurality of bushings and pins, interposed between the links so as to connect their ends to form the tracks.
  • the bushings and the supported links cooperate with each other to form a plurality of track joints, which allow the necessary rotational movement between adjacent links. This allows the articulation of the adjacent links when the track rotates wound around the (driving and/or driven) wheels of the track-type vehicle.
  • the rotation of the track allows the track-type vehicle to move on the ground to carry out the many functions for which it is intended.
  • the track-type vehicle typically a machine intended for ground movement
  • the replacement of one component of the track usually requires the track itself to be removed from the vehicle, carried out at a suitably equipped assistance centre. Consequently, the replacement procedure of the worn elements is very expensive and takes up a lot of time.
  • a track for track-type vehicles, according to the prior art, of the type provided with rotating bushings, is described, for example, in the American patent No. 5,183,318 to Caterpillar Inc.
  • a first drawback is due to the reduction of the structural rigidity of the entire tracks with respect to the tracks provided with fixed bushings. This reduction of the structural rigidity is due to the fact that the rotating bushings do not rigidly connect the links of the track.
  • Document US 6 270 173 B1 discloses a track with rotating bushings for track-type vehicles according to the preamble of claim 1.
  • Other tracks with rotating bushings for track-type vehicles according to the preamble of claim 1 are disclosed, for example, in documents US 5 183 318 A and US 2004/012260 A1 .
  • the general purpose of the present invention is therefore that of making a track with rotating bushings for track-type vehicles, able to increase not only the life and the wearing of the bushings, but also that of the other elements that form the joints of the track with respect to the tracks according to the prior art.
  • Another purpose of the invention is that of providing a track with rotating bushings for track-type vehicles, which makes it possible to obtain a balanced level of wearing for all the components belonging to the track itself, with the consequent possibility of better planning the maintenance operations on the track-type vehicle.
  • Yet another purpose of the invention is that of being able to have a track with rotating bushings for track-type vehicles, that is easy to repair and that is interchangeable with other analogous tracks of the known type.
  • the track 10 substantially consists of a continuous sequence of articulated joints 12, 12' of the hinge type, oriented according to an axis A-A substantially perpendicular to the central longitudinal development axis B-B of the track 10.
  • the articulated joints 12, 12' are connected to each other and maintained at a constant distance through pairs of links 14 having longitudinal development, arranged laterally and symmetrically with respect to the longitudinal central axis B-B of the track 10.
  • Each link 14 is of the asymmetrical type, that is to say provided with a first end flange 16 facing outwards the track 10, if seen with reference to the longitudinal central axis B-B, and with a second end flange 18 facing inwards the track 10 or, in other words, towards the longitudinal central axis B-B of the track 10 itself.
  • Each link 14 is thus provided with a first, substantially flat, upper surface 20 intended to irremovably support the shoes 48 ( figure 3 ), which complete the tracks of the vehicle.
  • a first upper surface 20 of each link 14 one or more through holes 22 are performed intended to receive the engagement means 50, usually bolts, between the link 14 itself and the relative shoe 48 intended to rest on the ground.
  • Each link 14 is moreover provided with a second, also substantially flat, lower guide surface 24 opposite with respect to the first upper surface 20 and intended to be engaged with the driven wheels, the lower rollers and the upper rollers for supporting the track, of the track-type vehicle.
  • a first through hole 26 is obtained oriented according to an axis A-A perpendicular to the longitudinal central axis B-B of the track 10.
  • a first annular groove 28, facing outwards the track 10, and a second annular groove 30, facing inwards the track 10, are then respectively obtained.
  • the external 28 and internal 30 annular grooves have an internal diameter which is greater with respect to the internal diameter of the through hole 26.
  • the internal annular groove 30 has an internal diameter which is greater with respect to the internal diameter of the external annular groove 28.
  • a second through hole 32 facing inwards the track 10, of every link 14, facing inwards the track 10, of every link 14, is made.
  • an annular groove 34 the internal diameter of which is greater than the internal diameter of the adjacent through hole 32, is then made.
  • the internal diameters of the second through hole 32 and of the internal annular groove 30 of the first through hole 26 are substantially equal. This characteristic allows particular elements of the track 10, which shall be specified soon after, to be inserted inside the second through hole 32 and the internal annular groove 30 of the first through hole 26.
  • each one of them is mainly made up of a substantially cylindrical pin 36, 36', oriented along an axis A-A perpendicular to the longitudinal central axis B-B of the track 10.
  • Each pin 36, 36' is provided inside with channelings 38 ( figure 4 ) intended for the circulation of the lubricant fluid, necessary for the track 10 to work properly.
  • a bushing 40 free to rotate with respect to the pin 36, 36' itself is mounted.
  • the teeth of the driving wheels of the track-type vehicle engage, in a manner such as to set the whole track system in motion.
  • Each one of the links 14 is connected to a corresponding pin 36 through interference coupling, i.e. in a non-rotatable manner, of its outward facing end flange 16 with one of the ends of the pin 36 itself.
  • each link 14 is mounted around the relative pin 36 through its insertion inside the through hole 26 foreseen on the first end flange 16 facing outside of the link 14 itself.
  • the locking into position between the first end flange 16 facing outwards with respect to the link 14 and the end of the pin 36 is obtained by means of a ring 42 of the "Seeger" type, integrally joined with the pin 36 itself and housed inside the external annular groove 28 foreseen on such an end flange 16.
  • Each link 14 is moreover rotatably connected to the next pin 36' through the insertion of the latter inside the through hole 32 foreseen on the second end flange 18 facing inwards with respect to the link 14 itself.
  • at least one annular-shaped sliding bearing 44 is then housed inside of each through hole 32. More precisely, each sliding bearing 44 is housed, press-fitted, between the internal circumferential surface of each through hole 32 and the external circumferential surface of one of the pins 36, 36', guaranteeing the free rotation around the axis A-A thereof.
  • the sliding bearings 44 are made from a metallic material and their resistance to the stresses undergone by the track 10 of the track-type vehicle in the work steps, depends upon the size characteristics of the aforementioned bearings. Therefore, according to the invention, the ratio R 0 between the length S and the related internal diameter D of each sliding bearing 44 is greater than 0.60. Preferably, such a ratio is greater than 0.65.
  • R 0 0.65
  • sealing groups 46, 46' are provided intended to cooperate with the rotating bushings 40, the links 14 and the sliding bearings 44 themselves to provide a sealing system for the articulated joints 12, 12'.
  • one of the sealing groups 46 is housed inside the second annular groove 30, facing inwards the track 10, made at the first through hole 26 of each link 14, whereas the other sealing group 46' is interposed between the sliding bearing 44 itself and the rotating bushing 40 and it is housed inside the second through hole 32 of each link 14.
  • the sealing groups 46 can be of the type described in the international patent application No. WO2008/093160 , to the same Applicant, and shall not be explained in detail hereafter.
  • the ratio R 1 between the overall width L 1 of the lower guide surface 24 of each link 14 and the overall thickness L 2 of the first end flange 16, facing outwards the track 10, of the link 14 itself must be greater than 1.
  • a ratio R 1 is comprised in the range between 1.1 and 1.3.
  • the ratio R 2 between the overall width L 1 of the lower guide surface 24 of each link 14 and the offset L 3 between the external surface of the first end flange 16, at the first annular groove 28, and the external edge of the lower guide surface 24 of the link 14 itself must be greater than 1.35.
  • such a ratio R 2 is comprised in the range between 1.4 and 1.65.
  • the ratio R 3 between the overall thickness L 2 of the first end flange 16, and the overall thickness L 4 of the second end flange 18, facing inwards the track 10, of the link 14 itself must be smaller than 1.25.
  • such a ratio R 3 is comprised in the range between 1 and 1.1.
  • the aforementioned geometrical/size characteristics of the links 14 thus make it possible to obtain an overall resistant section that is greater than that of known type links. Consequently, even if there is a bushing 40 of the rotating type, the stability of the articulated joints 12, 12' is not compromised even though the bushing 40 itself is no longer a single piece with the links connected to it, as occurs on the other hand, in the conventional type tracks with a fixed bushing.
  • the particular size characteristics of the sliding bearings 44 finally make it possible to obtain a good resting surface for the links 14 on the relative pins 36, 36' even if such elements are deformed while loaded, as happens when the articulated joints 12, 12' undergo stress in the work steps of the track-type vehicle.
  • the track with rotating bushings for track-type vehicles of the present invention thus conceived can however undergo numerous modifications and variants, all covered by the same inventive concept.
  • the materials used, as well as the shapes and sizes can be any according to the technical requirements.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Sliding-Contact Bearings (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Chain Conveyers (AREA)
  • Vehicle Body Suspensions (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Springs (AREA)
  • Handcart (AREA)

Claims (9)

  1. Chenille (10) pour véhicules de type à chenille, comprenant une séquence continue de joints articulés (12, 12') du type articulation, et comprenant des pivots (36, 36') orientés suivant un premier axe (A-A) sensiblement perpendiculaire à l'axe de développement longitudinal central (B-B) de la chenille (10), lesdits joints articulés (12, 12') étant connectés entre eux et maintenus à une distance constante par l'intermédiaire de paires de maillons (14) ayant un développement longitudinal, agencés latéralement et symétriquement par rapport audit axe central longitudinal (B-B), chaque maillon (14) étant muni d'une première bride d'extrémité (16) faisant face vers l'extérieur de la chenille (10), en référence audit axe central longitudinal (B-B) et d'une deuxième bride d'extrémité (18) faisant face vers l'intérieur de la chenille (10), en référence audit axe central longitudinal (B-B), chaque maillon (14) étant pourvu d'une première surface supérieure (20) et d'une deuxième surface inférieure de guidage (24), opposée par rapport à ladite première surface supérieure (20), un premier trou traversant (26) étant réalisé sur ladite première bride d'extrémité (16), orienté suivant ledit premier axe (A-A), pour la connexion non rotative dudit maillon (14) avec un desdits pivots (36, 36') dudit joint articulé (12, 12'), et un deuxième trou traversant (32) étant réalisé sur ladite deuxième bride d'extrémité (18), orienté suivant ledit premier axe (A-A), pour la connexion rotative dudit maillon (14) avec un desdits pivots (36, 36'), caractérisée en ce que:
    - le rapport (R1) entre la largeur totale (L1) de ladite deuxième surface inférieure de guidage (24) et l'épaisseur totale (L2) de ladite première bride d'extrémité (16) est compris dans la plage entre 1,1 et 1,3,
    - le rapport (R2) entre la largeur totale (L1) de ladite deuxième surface inférieure de guidage (24) et le décalage (L3) entre la surface extérieure de ladite première bride d'extrémité (16) et le bord extérieur de ladite deuxième surface inférieure de guidage (24) est compris dans la plage entre 1,4 et 1,65, et
    - le rapport (R3) entre l'épaisseur totale (L2) de ladite première bride d'extrémité (16) et l'épaisseur totale (L4) de ladite deuxième bride d'extrémité (18) est compris dans la plage entre 1 et 1,1.
  2. Chenille (10) selon la revendication 1, caractérisée en ce que au moins un palier à glissement de forme annulaire (44) est logé à l'intérieur dudit deuxième trou traversant (32) de chaque maillon (14), le rapport (R0) entre la longueur (S) et le diamètre intérieur correspondant (D) dudit palier à glissement (44) étant supérieur à 0,60.
  3. Chenille (10) selon la revendication 2, caractérisée en ce que ledit rapport (R0) entre la longueur (S) et le diamètre intérieur correspondant (D) dudit palier à glissement (44) est supérieur à 0,65.
  4. Chenille (10) selon la revendication 2 ou 3, caractérisée en ce que ledit palier à glissement (44) est ajusté à force entre la surface circonférentielle intérieure dudit deuxième trou traversant (32) et la surface circonférentielle extérieure dudit pivot (36, 36'), garantissant la libre rotation autour dudit premier axe (A-A) de celui-ci.
  5. Chenille (10) selon l'une quelconque des revendications 2 à 4, caractérisée en ce qu'une bague (40) libre de tourner par rapport audit pivot (36, 36') est montée autour dudit pivot (36, 36') et de manière coaxiale avec celui-ci.
  6. Chenille (10) selon la revendication 5, caractérisée en ce que deux groupes d'étanchéité (46, 46') sont prédisposés de chaque côté desdits paliers à glissement (44), lesdits groupes d'étanchéité (46, 46') étant destinés à coopérer avec ladite bague (40), lesdits maillons (14) et lesdits paliers à glissement (44) pour fournir un système d'étanchéité pour les joints articulés (12, 12').
  7. Chenille (10) selon la revendication 6, caractérisée en ce qu'un premier desdits groupes d'étanchéité (46) est logé à l'intérieur d'une rainure annulaire (30) faisant face vers l'intérieur de la chenille (10), en référence avec ledit axe central longitudinal (B-B), réalisée au niveau dudit premier trou traversant (26).
  8. Chenille (10) selon la revendication 7, caractérisée en ce qu'un deuxième desdits groupes d'étanchéité (46') est interposé entre ledit palier à glissement (44) et ladite bague tournante (40) et il est logé à l'intérieur dudit deuxième trou traversant (32).
  9. Chenille (10) selon l'une quelconque des revendications précédentes, caractérisée en ce que la connexion non rotative dudit maillon (14) avec ledit pivot (36, 36') est obtenue au moyen d'un anneau (42) du type "Seeger", uni intégralement avec ledit pivot (36, 36') et logé à l'intérieur d'une rainure annulaire (28) faisant face vers l'extérieur de la chenille (10), en référence avec ledit axe central longitudinal (B-B), réalisée sur ladite première bride d'extrémité (16) au niveau dudit premier trou traversant (26), ledit anneau (42) fournissant le verrouillage en position entre ladite première bride d'extrémité (16) et l'extrémité dudit pivot (36, 36').
EP10716865.0A 2009-03-24 2010-01-27 Chenille avec douilles rotatives pour véhicules de type à chenilles Active EP2411264B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI2009A000462A IT1399166B1 (it) 2009-03-24 2009-03-24 Catena a boccole rotanti per veicoli cingolati
PCT/IB2010/000147 WO2010109277A1 (fr) 2009-03-24 2010-01-27 Chenille avec douilles rotatives pour véhicules de type à chenilles

Publications (2)

Publication Number Publication Date
EP2411264A1 EP2411264A1 (fr) 2012-02-01
EP2411264B1 true EP2411264B1 (fr) 2013-05-01

Family

ID=41328436

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10716865.0A Active EP2411264B1 (fr) 2009-03-24 2010-01-27 Chenille avec douilles rotatives pour véhicules de type à chenilles

Country Status (8)

Country Link
US (1) US8851582B2 (fr)
EP (1) EP2411264B1 (fr)
JP (1) JP5791591B2 (fr)
KR (1) KR101698620B1 (fr)
CN (1) CN102421661B (fr)
BR (1) BRPI1009151B1 (fr)
IT (1) IT1399166B1 (fr)
WO (1) WO2010109277A1 (fr)

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US9126645B2 (en) * 2011-06-28 2015-09-08 Caterpillar Inc. Track chain cartridge having thrust bearings
JP5247913B1 (ja) * 2012-05-24 2013-07-24 株式会社小松製作所 履帯連結装置
JP5230836B1 (ja) 2012-09-03 2013-07-10 株式会社小松製作所 履帯用リンクおよび履帯装置
JP5775894B2 (ja) 2013-03-06 2015-09-09 株式会社小松製作所 履帯連結装置
USD775239S1 (en) 2015-08-13 2016-12-27 Caterpillar Inc. Rail guide
US10065692B2 (en) 2015-08-13 2018-09-04 Caterpillar Inc. Track link structure and pin joint assembly
JP6730920B2 (ja) * 2016-12-28 2020-07-29 株式会社小松製作所 履帯用軸受ブシュおよびその製造方法
USD823349S1 (en) 2017-05-04 2018-07-17 Caterpillar Inc. Undercarriage track shoe for mobile earthmoving machine
USD832308S1 (en) * 2017-07-27 2018-10-30 Deere & Company Track link
ES2918014T3 (es) * 2017-11-27 2022-07-13 Italtractor Conjunto de conexión para cadenas articuladas
US10919588B2 (en) * 2018-02-23 2021-02-16 Caterpillar Inc. Track pin and bushing retention design for a track chain
US10981612B2 (en) * 2018-08-22 2021-04-20 Caterpillar Inc. Flanged master track pin with retaining ring
CN109383652B (zh) * 2018-12-05 2024-04-30 江苏徐工工程机械研究院有限公司 履带总成安装结构及作业车辆
US11492056B2 (en) * 2019-01-10 2022-11-08 Caterpillar Inc. Track link having canted rail surface edges and machine track with same
US11312433B2 (en) * 2019-01-23 2022-04-26 Caterpillar Inc. Sealing system for a track

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Also Published As

Publication number Publication date
IT1399166B1 (it) 2013-04-11
JP5791591B2 (ja) 2015-10-07
KR20110138224A (ko) 2011-12-26
CN102421661B (zh) 2013-12-04
CN102421661A (zh) 2012-04-18
US8851582B2 (en) 2014-10-07
WO2010109277A1 (fr) 2010-09-30
ITMI20090462A1 (it) 2010-09-25
BRPI1009151B1 (pt) 2020-06-23
EP2411264A1 (fr) 2012-02-01
JP2012521326A (ja) 2012-09-13
KR101698620B1 (ko) 2017-01-20
US20120068530A1 (en) 2012-03-22
BRPI1009151A2 (pt) 2016-03-01

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